Force-feed lubricating system, etc.



Dec. 13, 1927.

l. COWLES FORCE FEED LUBEICATING SYSTEM, ETC

2 Sheet's-Sheet 1 Filed Nov. 29, 1924 l|||||1||| v wmf y////// M Patented Dec. 13, 1927.

IRVING COWLEB, OF CHICAG?, naaINOIS.

PATENT OFFICE.

FORCE- FEED LUBBICATING SYSTEM, ETC.

` Application tiled November 29, 1924. Serial No. 752,916.

This invention has for its object to rovide a direct pressure, measured feed lu rieating system for simultaneously feeding y lubricant at intervals from a central element to a number of bearings or other elements to be supplied therewith, uch as engine and pump cylinders, etc., wlth such quantity or volume of lubricant as may be required by each such element independently of all others under substantially the ful and direct pressure exerted at the central element and simultaneously with the-application of said pressure.

The system comprises, preferably, a central pump or the like, manuall or otherwise operable at intervals to disc arge lubricant under high pressure into piping leading to the several bearings or other elements'to be supplied, and devices interposed in said piping which effect, automatically, the measuring of the volume of lubricant to be supplied to each said element and the delivery of such measured or predetermined volume to said element under the full, direct pressure at which the lubricant is delivered from the pump and simultaneously with the application of pressure at the pum The objects of the invention include, in so far as the said measuring devices are conso cerned. the provision of fluid pressure actuated means for effecting discharge of the predetermined or measured volume of lubricant to the bearing or the like to be supplied therewith` simultaneously with the mtake into the device of a similar'volume for-delivery at the next succeeding actuation, and the automatic transfer of the freshly received lubricant from the intake into the delivery end of the device between successive actuations. v f

A further object of the invention is to provide a device of the character'defined in the next precedin paragraph, which may be easily and quic ly adjusted to vary' the volume of lubricant discharged thereby-atv each actuation without removing the same tion is to provide a device as'defined in the three next preceding paragraphs which is constructedwholly of parts ca a le of being produced by automatic an semi-automatic machinery and wherein ampletoler-V ances are plermissible and necessary, respectively, to t ereby render the same easily and cieapl-y producible, and easy of assembly, e c.

A further object of the invention is to provide a lubricating system of the type specified which includes means, such as an auxiliary pump or pumps, whereby any-desired grou of bearlngs may besu plied at intervals letween operations of tllie main pump for supplying all bearings in the system without in any way interfering with t 1e operation of the main pump with respect to supplying all bearin s simultaneously.

Another important o ject of the invention is to provide a device for feeding a measured volume of lubricant under, pressure, as above defined, Awhich may be adjusted to vary the volume fed thereby to an engine compressor, pump cylinder or other unit presentin counter-pressure to the oil, during operation of the said en ine or the like, without interruption of sai operation.

While the invention relates particularly to force-feed lubrication, it will be obvious that it may also be applied to feeding fluids other than lubricating oil, as, for example, feeding measured quantities of water-softening or treating fluid to water; or, vice versa, feedin water in measured quantities for any esired purpose; feeding measured quantities of syrups or flavoring extracts, etc., and many other purposes. v

The invention may be variously embodied and in the accompanying drawings I have illustrated several embodlments thereof.

In said drawings:

Fig. v1 is a view in central longitudinal section, of a pump for feeding fluid through piping to a number of bearings, the piping being yshown mainly in elevation, together with fluid measuring devices embodying the invention interposed in the same.

Fig. 2 is a central longitudinal section of al fluid measuring device constructed in accordance with the invention.

Fig. 3 is a plan section on theline 3 3 of Fig. 4 is a side elevationof the device of Figs. 2 and a.

Yao

Fig. '5 is a view` similar to Fig. 2, illustrating another embodiment of the ,fluid measuring device, and Fi 6- in a cross section on the line 6-6 of ig. 5.

The system or apparatus of my invention includes an ordinary pump 1, which may be manually or otherwise operated to discharge contained lubricating oil or other fluid, into iping leading to oints of discharge, un er a pressure suiiicient to readily overcome resistance to its discharge into a bearing, engine or pump cylinder or other device.

Preferably the pump cylinder has a checkvalve controlled connection 2 with a suitable source of supply of the iuid, said source being omitted from illustration. In most instances a manually operable pump will robably be used and I have, therefore, illustrated the pump-piston 3 as equipped with a iston-rod 4 passing through the removable iiead 5, a compression spring 6 bein operatively associated with the piston-ro 4 and head 5 to normally maintain the piston at the outer limit .of its suction stroke. The lever 7 pivotally secured to the head 5 and disposed to bear between its ends on the piston-rod, may be manually or otherwise actuated to impart movement to the piston 4 against the action of the spring. For reasons hereinafter explained, the dischargeport 8 of the pump-cylinder 1 is not equipped with a check-valve.

The, piping consists, preferably, of the main lead 9, and main and auxiliary branches 10, 11 and 12, respectively, the group 12, for example, leading to a certain group of bearings of a certain machine or to a iven oup of other elements to be supplied wit the fluid and which, under certain conditions, it may be des1rable to supply independently of all other bearings or the like, comprised in the system. For-this purpose there is interposed in the branch 11 a small manually operable pump 13 corre- 'spending in construction with the pump 1.

The several-devices to be supplied with the fluid' are indicated by reference characters 14 and, for convenience, indicate bearings to be lubricated.

Interposed in each lead to a bearing or a grou of bearings or other devices 14 t0 be supp ied with the fluid, is a measuring device such as is shown in Fig. 2, or a modication thereof such as is shown in Fig. 3, or as further modilied by omission of parts as hereinafter explained.

The device of Fig. 2 represents the preferred embodiment of the invention. It comprises the housing element 15 made, Apreferably, from hexagonal metal rod, such as brass, having the threaded stem 16, the internal threads 17, and the smooth bore portion 18 of larger diameter than the threaded cylindrical bore 22 terminating in a valveseat 23 bordering the intake port 24. For the sake of convenience and low cost of manufacture, the intake end of the element 21 constitutes a part of the compression pipe coupling which includes the packing element 24a and sleeve 25 for rolling the tapered end portion of the packing element 24* into engagement with the tubing through which fluid is supplied.

The element 21 is provided at its lower or outer end with external threads t0 engage the internal threads of the element 15, and is further provided with a smooth cylindrical outer surface portion 26 terminating at the annular shoulder 27, said smooth portion 26 being opposed in whole or in' part to the smooth bore portion of the element 15 and being of suiiciently smaller diameter than the latter to permit a packing 28 to be disposed in the annular space between said smooth surfaces. Y

Mounted for reciprocation in the bore 22 'of the. member 2l, is the hollow trunk-piston 29 in the head of which is a central opening 30 bordered by the valve-seat 31 on which the valve 32 is adapted to seat,rthe latter being also adapted to seat on the valve-seat 23. Said valve is preferably provided with a short stem 33 adapted to 'project into and substantially fit the intake port 24. Said valve is also provided with a short stem or shank 34 having a reduced outer end rtion 35 which is passed through the centra opening in the radially corrugated disk 36', the free end portion of said portion 35 being upset to provide the head 37, the space between the latter and the shoulder 38 being greater than the thickness of the disk 36,

and the opening in the .latter of slightly greater diameter than the shank-portion 35, so that said disk and valve have relative play to therebypermit said valve to easily find its respective seats 23 and 31.

helical compression spring 39 is interposed between the disk 36 and the fhead of the housing-element 15 which serves to normally maintain the valve 32 on the seat 23 and olf the seat 31, the relative movement'o said valve and piston being such `that the opening movement of the former relatively to the seat 31 is very limited. The: spring vthus also serves to maintain the piston at the termined volume, but also age past the piston due to maintenance'of pump ressure may not cause a continuing flow. o lubricant from the discharge rt.

The operation of the device is as ollo ws: Upon actuating the pump-piston 3 against the spring 6, fluid under pressure will 'be forced into the piping and thus into the 1ntake port 24 of each of said devices 15-21. As the latter is completely filled with fluld at lthe time of such pump-actuation, and the piston 29 so snugly fit-s the bore 22 as to mitigate against too -free movement thereof, and its movement is further resisted by the fiuid between the same and the discharge port, the first result of inrush of fluid will be to seat the valve 32 on the seat 31 and thereupon force the piston 29 to the seat 40. During this stroke the Huid last-mentioned will be, in part, discharged from the device, the volume thus discharged being accurately deter mined by the length of the piston-stroke and the lat-ter, in turn, is determined by the relaltive positions of the housing-members and21. The minimum piston-stroke is indicated in Fig. 2 and the maximum in Fig. 5, a groove 41 being provided on the member 21 for indicating when the housing-members 15 and 2l are relatively positioned for` the maximum piston-stroke.

Upon release ofthe pump-piston 3, the latter is returned to its initial position by the spring 6 and thus the pressure in the housing 15-21 and in the piping is completely relieved.

The spring 39 will thereupon throw the valve 32 oii` the seat 31 and then return the piston 29 to the. position shown in Fig. 2. The check-valve S-being closed, the piston 29 cannot possibly force the fluid which entered the housing 15-21 back into the piping, because a vacuum is created in the discharge end-of said housing which will cause the entered charge of fluid to pass through the now opening piston-port 30 from the intake to the discharge end of said housing. The force exerted by the spring 39 in each of the housings 15-21 must so far exceed that 'exerted by the spring holding the check-valve for the intake-port of the pump 1 closed as to insure inux of Huid to the pump cylinder 1 as the pistons 3A and 29 return to initial positions.

From the foregoiong it will be obvious that the fluid discharged from each of the housings 15-21 will be not only of predeunder the direct and substantially full force of the pumppressure. Each one of a. large number of said devices 15-21 may be adjusted independently of all others to deliver whatever volume of iuid may be desired, such adjustment being easily effected at any time by merely retracting the sleeve 25 so as to permit rotation of the housing-element 21 relatively to the feed-pipe therefor, it being the return only essential that the piping, which will consist of cop r tubing, shall include a sufficient excess taken up in bends) as to each lead, to permit the said adjustment.

The compression-pipe couplings shown are fully described and claimed in m application for U. S. Letters Patent erial N o. 25,873, filed April 25, 1925, attention being also directed to the fact that Figs. 2 and 3 of the accompanying drawings times the size of the average device used most extensively commercially for lubrication. The range of adjustment of the iston-stroke is such that the volume of uid discharged may vary from a drop or two to a comparatively large amount.

The ease of'adjustment is of considerable importance, in that there are many emergencies in which adjustments must be quite rapidly eilected especially where temporary hand-lubrication is not possible. This necessity may arise particularly in the lubrication of engine, pump and compressor cylinders. Convenience of adjustment is also highly desirable in the lubrication of machine bearings as, following iniare four tial installation, it will usually be found that some bearmgs receive an excess and others too little lubricant, the intervals of pump actuation being determined by the needs of the bearing in the system whose requirements must be promptly supplied. Improper adjustments thus occasion waste of lubricant and the accompanying drippings and spatterings.

In every lubricating system which feeds a. number of machines, some of which are operated more steadily than others, it is advisable to provide means for independently feeding lubricant to each machine or to any given group of bearings between intervals of lubricant charges' to all bearings in the entire system deliveredfrom the pump l. This is very easily accomplished by associating with any desired bearing or group of bearings in the system, a pump 13 interposed in the pipe line feeding said bearing or group thereof, said pump 13 being exact-ly similar to pump 1.

Actuation of the pump 13 will, by reason of t-he check-valve at the intake-port thereof, throw a into the. particular bearing or group thereof associated with the discharge end of the pump of the plunger of vsaid pump to initial position will create a vacuum suiiicient to draw oil fromV the source thereof past the check-valve controlled in.- take-ports of the pumps 1 and 13. Obviously, the pum 1 may be omitted and pumps 13 used t roughout the system, all thereof in that eventc'ommunicating directly with the source. retained for operation only in emergencies 13. Following such actuation, y

Or the pump 1 may be lll) measured charge of lubricant such als might arise by breakage of a pump 13, thV latter being ordinarily used to the exclusion of said pump 1.

The device .of ig. 5 correspo ds in con-` struction with that of Fig. 2, except to the extent that the trunk-piston 42, use in place of the piston 29, is devoid of the valve-controlled port 3() and is so loosely mounted as to permit resisted and restricted flow of lubricant past the same. This flow will take lace only when the said piston is returned y the spring 39 to its normal position following a discharge stroke thereof.

The said piston A42 is provided adjacent its head end with an external annular groove 43 which opposes the flange of the leather cup-washer 44 mounted on said piston and clamped between the head thereof and the valve-element 45 which normally seats on the valve-seat 23. Said piston 42 is preferabl hexagonal externally, the ridges, prefera ly partly cut away, and snugly fitting the bore 22 and the fiat surfaces coacting with said bore to provide passages for fluid.

In operation, an incoming charge of fluid under pressure will start the piston 42 toward th discharge end of the casing 15-21. The fluid rapped in the last-named end por-v tion of the casing must overcome the resistance to opening offered by the check-valve 20 and thus the initial movement of said piston will cause an expansion of the flange of the cup-leather to hug the bore 22 duringV` the balance of the piston-stroke since the resistance to the said stroke continues, this being assured by using a sufliciently strong spring to maintain the check-valve 2O closed to more than counterbalance the resistance to piston-stroke offered by the spring 39. The initial piston movement will also serve to effect flaring of the cup-leather by reason of the restriction of flow of fluid into the housing until the short stem 33 of the valve end' vof the piston shall have passed the upper end of the valve-seat`23.

As soon as the lower end of the piston is seated on the valve-seat 40, the pressures on opposite sides of the "cup-leather will be equalized so that, as soon as the pump-pressure is relieved, the spring 39 will return the piston 42 to initial position as rapidly as the resistance to flow of fluid past said piston will permit. This will, of course, depend upon the degree of uidity or viscosity of the fluid and the area of the passage between the piston and the bore 22.

The foregoing' construction may be modified by omitting the cup-leather'washer 44, in which vevent the annular groove 43 will be unnecessary. In so modifying the structure, the spring associated with the checkvalve 20^must be so light as to permit dis- .charge'of fluid at a far more rapid rate than the entering fluid can pass the piston, the spring 39 being, in that event, as light as its stroke against its holding spring,

possible, viz: lust strong enough to overcome resistance to t e passage of the fluid past the piston on the return stroke of the latter.

The omission of the cup-leather washer 44 is disadvantageous, in thatthe tolerance between the piston 42 and the bore 22 must decrease as the fluidity of the liquid increases, or, in other words, said tolerance must be increased in direct ratio to increase in viscosity of the fluid or liquid.

The bore of as the diameter-and ordinary strength requirements permit, in order that oil may be stored therein for gravity feed to the bearing where the said stem is disposed to render such feed possible.

It will be obvious, of course that the oupwasher 44 constitutes a fluid-pressure responsive valve controlling the free space around the piston, the latter being the Vsubstantial equivalent of a piston-port.

While I have illustrated and described the invention in its preferred embodiments, it will be obvious that the same may be otherwise embodied without departure from the .scope and spirit of the invention as defined in the. appended claims.

I claim as my invention:

1. Pressure feed lubricating means including devices disposed to discharge lubricant to points to b e supplied, said devices each comprising a cylinder having an inlet and a discharge port,-a check-valve associated with "one of said ports for preventing return of fluid into said cylinder, a spring-held piston reciprocable in the latter between said ports, a valve-seat associated with the discharge port and on which one end of said piston seats to shut off discharge from said cylinder as said piston attains the limitbof n pass permitting flow of lubricant past said piston, a spring-held valve controlling said by-pass to maintain the latter normally open and adapted to be closed by fluid under pressure entering the inlet port and s o maintained during continuance of flow and duringr the stroke of said piston against its spring to thereby prevent by-passage of fluid during .usaid stroke, said valve adapted to be maintamed constantly open lduring the return stroke of said piston.

2. Pressure feed lubricating means includ ing devices disposed to discharge lubricant topoints to be'supplied, said devices each comprising a cylinder having an inlet and a discharge port, acheck-valve associated with one of said ports for preventing return of fluid into said cylinder, a spring-held piston reciprocable in the latter between said ports, a valve-seat associated with the discharge port and on which one end of said piston seats to shut off discharge from said cylinder as said piston attains the limit of its stroke against its holding spring, a byhe stem 16 may be as large ui under pressure'entering pass opening in said piston, a normally open spring-held valve controlling the same and ada ted to be closed and-so maintained by the intake port y during moveof said cylinder continuous to said fluid,

ment of said piston responsivel said valve ada ted to be opened7 and so maintained during the of said piston.

3. Pressure feed lubricating means including devices disposed to dischar e lubricant spring return `to points to be supplied, said evices each comprising a cylinder having an inlet and a disc arge port, a check-valve associated with one of said. orts for preventing return of fluid into said cylinder, a piston reciproca-ble in said cylinder between said ports, a valveseat associated with the discharge port and upon which one end of the piston seats as it attains the limit of its discharge stroke, a by-iass opening in said piston, a valve contro ing the same, a single spring common toy said valve and said piston tomaintain the former open and the latter normally at one limit of its movement, said valve ada ted to be closed and so maintained during t e disfluid controlled by said charge stroke of said piston responsively to fluid under pressure entering the intake port and to be opened andv so maintained during the entire return stroke of said piston.

4. In a force-feed-lubricating system including a source of lubricant adapted to be subjected to pressure at intervals, a device disposed between said source and an element to be fed with lubricant for delivering to the latter a predetermined volume of the same und'er substantial pressure, said device .including a casing, a spring held piston reciprocable therein, a c eck-valve associated with said casing for trapping fluid received from said source, and a valve-element associated with said piston a by-passage for valve, the latter adapted to be actuated by fluid under pressure entering said casing to` feed previously contained liuid to the element to be fed with same, said valve element associated with' said piston being fluid-pressure responsive and automatically closin the by-passage during actuation of said piston bythe entering fluid while permitting low of uid through said by-passage past the piston as the latter is sprin -returned to its normal position upon reli of pressure at the said source.

5. In a force-feed lubricating system, a device for delivering measured volumes of lubricant comprising a. cylinder having an intake-port at one end and a discharge port at its other end, a check-valve associated-with one of said ports, a piston reciprocable in 'said cylinder, a spring normally maintaining the same at the outer limit of its movement relatively to said discharge port, a bypassage for fluid past said piston, and a fluid by its spring r-lubricant comprising a c pressure responsive valve carried by the lati ter and controlling said by-passage, said piston adapted to be actuated against said spring by fluid under pressure entering said intake-port for dischargin fluid disposed between said piston and said discharge port, said fluid pressure responsive valve arranged for automatic actuation to close said by-passage by differences in fluid pressure at op osite ends of said piston during said actuation thereof and opening under the influence of the spring-pressure returning said piston to its norma position.

6. In a force-feed lubricating system, a device for delivering measured volumes of lubricant comprising a cylinder having an intakeort at one end and a discharge port at its ot er end, a check-valve associated with said discharge port, a'piston reciprocable in said cylinder, a spring normally maintaining the same at the outer limit of its movement relatively to said discharge port, a' bypassage for luidpast said piston, and a fluid pressure responsive valve carried by the lat- .spring by fluid `under pressure entering said intake-port for dischargin between said piston and sai said fluid pressure responsive fluid disposed valve arranged discharge port,

for automatic actuation to close said by-passage'by differences in fluid pressure at opposite ends of said piston durin said actuation thereof and opening under t e influence of the spring-pressure returning said piston to its normal ositi'on.

`7. Ina device for delivering measured volumes of linder having an intake-port at one end an a check-valve controlled discharge port at the other end, a valve-seat at each end of said cylinder, a spring held piston reciprocable in the latter orce-eed lubricating system, a

and normally disposed at the outer limit of its movement' relatively to the discharge port, said piston including valve-formations ada ted to seat on said respective valve-seats as t e same attains the respective limits of its movement, there being a by-passage for fluid past said piston, a {iuid pressure responsive valve carried by the piston and arranged to respond .to ldifferences in pressure at opposite ends of the latter to maintain said by-passage closed durin actuation of the piston against its sprin y fluid under pressure entering the inta e-port of said cylinder and opening said by-passage during spring return of said piston to normal position.

8. In a force-feed lubricating system, a device for delivering measured volumes of lubricant comprising a cylinder having an intakeort at one end and a discharge port'at its ot ery end, a check-valve associated with one of said ports, apiston reciprocable in Vsaid intake-port for` dischargin said cylinder, a spring normally maintaining the same at the outer limit of its movement relatively to said discharge port, a bypassage for fluid past said piston, and a fluid pressure responsive valve carried by the latter and controlling said by-passage, said piston adapted to e actuated against said spring by fluid under pressure entering said intake-port for dischargin fluid disposed between said piston and sai discharge-port said fluid pressure responsive valve arranged for, automatic actuation to close said by-passage by diderences in fluid pressure at opposite ends of said piston during said actuation thereof and opening under the influence of the spring-pressure returning said piston to its normal position, and means for adjusting the stroke of said piston to vary the volume of fluid'delivered from said casing at each actuation of said piston.

9. In a force-feed lubricating s stem, a device for delivering measured vo urnes of lubricant comprising a cylinder having an intake-port at one end and a discharge port at its other end, a check-valve associated with one of said ports, a piston reciprocable in said cylinder, a spring. normally maintaining the same at the outer limit of its movement relatively to said discharge port, a by-passage for fluid past said piston, and

a fluid pressure responsive valve carried bythe latter and controlling said by-passage, said piston ada ted to be actuated against said spring by uid under pressure entering fluid disposed between said piston an said discharge port, said fluid pressure responsive valve arranged for automatic Vactuation to close said by-passage b differences in fluid pressure at opposite en s of said piston during said actuation thereof and opening under the influence of the spring-pressure returning said piston to its normal position, said cylinder composedof. a plurality of parts adjustable relatively to each other for varying the length thereof to thereby vary the stroke of said iston.

10. In a forceeed lubricating system, a device for delivering measured volumes of lubricant comprising a cylinder having an intake-port at one end and a discharge port at itsv other end, a check-valve associated with one of said ports, a piston reciprocable in said cylinder, a spring normally maintaining the same at the outer limit of its movement relatively to said discharge port, a by-passage for fluid past said piston, and a fluid pressure responsive valve carried by the latter and controlling said by-passage, said piston adapted to Vbe actuated against said spring by uid under pressure entering said intake-port for discharging fluid disposed between said piston and said discharge port, said fluid pressure responsive valve arranged for automatic actuation to close said i,esavee by-passage by differences in fluid pressure at opposite ends of said piston during said actuation thereof and opening under the influence of the sprin -pressure returnin said piston to its normav position, said c 'inder composed of two parts having threa edenagement with each other for varying the ength of`said cylinder and thereby vary the stroke of said piston.

11. In a-.force-feed lubricating system, a device for delivering measured volumes of lubricant comprising a cylinder having an intake-port at one end and a discharge port at its other end, a check-valve associated with one of said ports, a piston reciprocable in said cvlinder, a spring normally maintaining the same at the outer limit of its movement relatively to said discharge port, a luy-passage for fluid past said piston, and a fluid pressure responsive valve carried by the latter and controlling said lay-passage, said piston adapted to be actuated against said spring by fluid under pressure entering said intake-port for dischargin fluiddisposed between said piston and said discharge-port, said fluid pressure responsive valve arranged for automatic actuation to close said by-passage by. differences in fluid pressure at opposite ends of said piston during said actuation thereof and opening under the influence of the spring-pressure returning said piston to its normal position, and means operable from the exterior of the cylinder for effecting variation of the stroke of said piston.

n.12. In a force-feed lubricating system, a device for delivering predetermined volumes of lubricant under pressure, including a casing adapted for connection with a pump for supplying fluid under pressure thereto, fluid-v pressure responsive spring held means within said 'casing for ejecting therefrom a prede-` termined volume of lubricant simultaneously with the entry into the same of a charge of lubricant from the pum said fluid pressure responsive means inc uding means for trapping and retaining a volume of said entering lubricant equal to the discharged volume thereof following each actuation' thereof, saidI casing adjustable in length to therebygvary the zone\of action of said fluid pressure responsivemeans and proportionately vary thegsvolume of lubricant discharged at each actuation thereof.

13. In aforos-feed ,lubricating system, a casing provided at opposite ends with an intake-portand a check-valve controlled dis-l charge '.port, a piston reciprocable therein, an opening in said piston, a valve controlling the same and Aopposed to the intake end of said casing, and a spring common to said valve and said piston for maintaining the latter normally in the intake end portion of' said casing and maintaining said valve normally open, the latter adapted to be closed` by fluid under pressure entering said casin to thereby cause said piston to be actuate by the same.`

14. In a force-feed lubricating system, a cylinder provided at opposite ends with an intake-port and a check-valve controlled discharge port. a valve seat borderin said intake-port. a trunk-piston reciproca le in said cylinder, a port in said piston, a valve controlling the saine and adapted also to seat on the valve-seat aforesaid, a spring common, tosaid valve and said piston for maintaining the lat-ter normally in thev inl take end portion of said cylinder and main taining said vvalve seated lon the valve-seat and maintaining said piston port open,`said valve adapted to close said piston-port as it is unseated by incoming fluid under pressure, to thereby cause the latter to move the piston to the discharge end portion of the cylinder.

15. In a force-feed lubricating system, a cylinder provided at opposite ends with an intake-Dort and a check-valve controlled discharge port, a valve seat bordering'said intake-port, a trunk-piston reciprocable in said cylinder, a port in said piston, a valve controlling the same and adapted also to seat on the valve-seat aforesaid, a spring cuminon to said valve and said piston for maintaining the latter normally in the intake end portion of said cylinder and maintaining said valve seated on the valve-seat and maintaining said piston port open, said valve adapted to close said piston-port as it is unseated by incoming fluid under pressure, to thereby cause the latter to move the piston to the discharge end portion of the cylinder, the latter comprising a plurality of relatively adjustable sections for varying its length to thereby vary the piston stroke.

16. In a force-feed lubrlcating system, a cylinder provided at opposite ends with an .intake port and a check-valve controlled dis- A charge port, avalve seat bordering said intake-port, a trunk-piston reciprocable in said cylinder, a port insaid piston, a valve controlling the same and adapted also to seat on the valve-seat aforesaid, a spring common to said valve and said piston for maintaining the latter` normally in the intake end portion of said cylinder and maintaining said valve seated on the valve-seat and maintaining said piston port open, said valve adapted to close said iston-port as it is unseated by incoming uid under pressure, to thereby cause the latter to move the piston to the discharge end portion of the cylinder, and means for adjusting the stroke of said piston.

17. In a force-feed lubricating system, a casing provided at opposite ends with an intake-port and a check-valve controlled discharge port, a piston reciprocable therein, an opening in said piston, a valve controlling the same and opposed to the intake end of said casing, a stop device loosely associated with said valve and said piston for limiting their relative movement whilev permitting passage of fluid when said valve is open, a spring bearing 'on said stop device casing provided at op osite ends with an in.

take-portand a chec -valve controlled discharge port, a piston' reciprocable therein, an opening in said piston, a valve controlling the same and opposed to the intake end of said casing, a. stop device loosely associated with said valve and said piston for limiting their relative movement while permitting passage of fluid when said valve is open, a spring bearing on said stop device for normally maintaining said valve open and said piston in the intake 4end portion of said casing, said valve adapted to be closed by fluid under pressure entering said cas# ing to thereby cause said piston to begactu-I ated by the same, said valve adaptedto seal said intake port against back-flow ofkk lubricant as it attains lts normal position.

19`. Ina force-feed lubricatino system, a casing provided at opposite ends with an intake-port and a check-valve controlled discharge port, a piston reciprocable therein, an opening in said piston, a valve controlling the same and opposed to the intake end of said casing, a 'stop device loosely associated with said valve and said piston for limiting their relative movement While permitting passage of fluid when said valve is open, a spring bearing on said stop device for normally maintainin said valve open and said piston in the inta e end portion of said casing, said valve adapted to be closed by uid under pressure entering said casing to thereby cause said piston to be actuated by the same,and a projection on said valve adapted to enter said intake-port as the same attains its normal position in said casing.

20. In a force-feed lubricatingsystem,v a cylinder provided at opposite ends with an .intake port and a check-valve controlled discharge port, a valve seat borderin said intake-port, a trunk-piston reeiprocab e in said cylinder, a port in said piston a valve controlling the same andadapted also to seat on the valve-seat aforesaid, a spring common to said valve and said piston for maintaining the latter normall in the intake end portion of said cylin er and maintaining said valve seated on the valve-seat and maintaining said piston port open, said valve err y ing fluid to pass through said port as said portion o `thereby cause the latter to move the ston tothe discharge end portion of the cy m'der,

and a projection on said valve adapted to enter the intake-port as it seats on said valve seat bordering the/latten 21. A force-feed lubricating system ncluding a pump element having a. valveless dischar e port, a casing connected at one end Wit the latter and provided at its other end. with a check-valve controlled discharge port, a'piston in said casing, a port in the latter, a. valve controllin said port, a spring associated with said va ve and said piston for maintaining said valve normally open` piston normally in the intake endy said casing,l said valve opposing theintake end of said casing and adapted and said to be closed by the initially entering uid under pressure, to thereby cause the latter to move the piston to the discharge end portion of the latter to eject the iiuid therein contained, said spring adapted to open said valve immediately upon release ol thepumppressure and coacting with said check-valve controlled discharge port to cause the enterpiston is spring-returned to normal position.

22. In a force feed lubricating system, a device associated with a bearing to be lubricated and including a casing consisting of two separable and relativelly adjustable members arrangedto permit t c varying of the length thereof, one of said members provided with a discharge port and the other with anintake port, and a spring-held Huid pressure responsive member within said cas- 1ng normally disposed at the intake end thereof and movab the dischargeport, the stroke 'of said membei.` variable coincidentally with variations e by iluid pressure to sealin flength of said casing to thereby vary the volume ot'v `oil dischargedl from? the latter at ach fluid pressure actuation of said memel, f i

23. In a force feed lubricating system, a

device associated with abearing to be fed including a casing presentin a cylindrical bore, there being intake and ischarge openings at respectivel opposite ends of said bore axially aligne therewith, a spring-held fluid pressure responsive member reciprocably mounted in said casing for movement between said o enings, said casing consist- -.ing of two mem ers'having threaded engage'- m'ent with each other to Ypermit adjustment other to permit adjustment thereof relativel ly to each other to increase and decrease the length of the casing and thereby correspondingly vary the stroke of said reciprocable member, said members of said casing presenting opposed smooth` cylindrical surfaces exteriorly of said bore, and a packing interposed between said surfaces;

v In testimony whereof, I have hereunto set my hand thisj22nd day of November, 1924.

:'[RVING CowLEs. 

